Abstract
The industrial synthesis of acrolein is mainly performed by propylene oxidation over bismuth-iron-molybdate catalysts. Among cleaner alternatives to produce acrolein, oxidative coupling of methanol and ethanol represents a promising way. In this work, the reaction has been performed in two separate reactors (for oxidation and aldolization) to study the role of the acid/base properties but also the competition of aldehydes adsorption over environmentally friendly spinel catalysts with various Al/Mg ratios. The acid/base properties of catalysts were investigated by NH3 and SO2 adsorption microcalorimetry. Further adsorption microcalorimetry studies were performed with methanol, formaldehyde, acetaldehyde and propionaldehyde to investigate the bounding properties of the reactants. The acid/base properties were correlated with acrolein yield and selectivity under oxidizing conditions. Co-adsorption of aldehydes was also investigated allowing justification of the absence of crotonaldehyde formation.
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